We primarily use 550 paracord, 100% nylon, purchased mainly from Europe. The belt portion is made of BioThane. This is a lightweight, soft collar. Color and size changes are possible. Please let me know on the dedicated page. Please comment. The collar size in the image is 23cm-26cm. Custom orders up to 35cm are priced as one item. Sizes larger than that are an additional 500 yen per 10cm. Discounts are available for orders of 2 or more, or for sets with a leash. You can check out other designs at #asowan_works☆ Thank you for looking.